(;AB[sb]AB[sc]AB[rd]AB[re]AW[rc]AW[qc]AW[rb]AW[qa]AW[pb]AW[ob]AB[mb]AB[nc]AB[md]AB[pc]AB[pd]AB[pf]C[Black to kill the white group!!!]AP[goproblems]
(;B[oa];W[na];B[nb]C[RIGHT])
(;B[pa];W[oa])
(;B[sa];W[oa])
(;B[ra];W[oa])
(;B[oc];W[oa])
(;B[nb];W[oa])
(;B[na];W[oa])
(;B[qd];W[oa]))